WO2016106719A1 - 一种信号的削波处理方法和设备 - Google Patents

一种信号的削波处理方法和设备 Download PDF

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Publication number
WO2016106719A1
WO2016106719A1 PCT/CN2014/095989 CN2014095989W WO2016106719A1 WO 2016106719 A1 WO2016106719 A1 WO 2016106719A1 CN 2014095989 W CN2014095989 W CN 2014095989W WO 2016106719 A1 WO2016106719 A1 WO 2016106719A1
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WIPO (PCT)
Prior art keywords
peak
signal
cancellation pulse
input signal
clipping
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PCT/CN2014/095989
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English (en)
French (fr)
Inventor
邱晶
田廷剑
窦蕴甫
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP14909526.7A priority Critical patent/EP3226500B1/en
Priority to PCT/CN2014/095989 priority patent/WO2016106719A1/zh
Priority to RU2017126970A priority patent/RU2667077C1/ru
Priority to BR112017014214-7A priority patent/BR112017014214A2/zh
Priority to CN201480083518.4A priority patent/CN107005513B/zh
Publication of WO2016106719A1 publication Critical patent/WO2016106719A1/zh
Priority to US15/636,748 priority patent/US10212013B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/2623—Reduction thereof by clipping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and device for clipping a signal.
  • a base station system is composed of a Baseband Unit (BBU) and a Radio Radio Unit (RRU).
  • Power Amplifier (PA) is the most important active device of the radio transmitter remote unit, which is used to amplify the input signal. PA efficiency is an important factor affecting the cost of wireless transmitters, but PA is not completely ideal.
  • PA power Amplifier
  • PA introduces nonlinear distortion, that is, the relationship between the output signal and the input signal exhibits nonlinear amplification.
  • the input signal needs power back-off, and the magnitude of the power back-off depends on the peak-to-average ratio of the signal.
  • the peak-to-average ratio is the ratio of the peak power of the signal to the average power.
  • the efficiency of the PA is higher because the gain is fixed and the output power is higher. Therefore, in order to ensure the linearity of the PA, the higher the signal peak-to-average ratio, the more power back-off is required, but this results in lower output power. Since the peak-to-average ratio of the signal is reduced, the efficiency of the PA can be indirectly improved. Therefore, the signal peak-to-average ratio is an important parameter of concern to the wireless transmitter.
  • a communication system using multi-carrier technology (such as Orthogonal Frequency Division Multiplex (OFDM)) has a high peak-to-average ratio of baseband signals.
  • the conventional method uses Crest Factor Reduction (CFR) technology. , reduce the peak-to-average ratio of the signal.
  • CFR Crest Factor Reduction
  • the original signal peak-to-average ratio is A (that is, the peak power divided by the signal average power), and a part of the larger amplitude signal will be located in the nonlinear amplification region; after the clipping technique, the peak-to-average ratio is reduced (Fig. 1 (B)), at this time, all signals are located in the linear amplification area.
  • the average power of the input signal can be increased, so that the peak power plus the gain is still equal to the saturation point, thereby improving the PA efficiency.
  • CFR technology also makes the error vector magnitude of the signal (Error Vector Magnitude, EVM) Boost, EVM boost means that the receiver is not easy to demodulate. That is to say, the CFR technology reduces the signal peak-to-average ratio at the expense of the EVM. If the EVM is too high, the receiving end cannot guarantee that the data symbols of all modulation modes are normally demodulated.
  • the widely used PC-CFR (Peak Cancellation CFR) algorithm is an effective algorithm for reducing the signal peak-to-average ratio.
  • the block diagram is shown in Figure 2.
  • the input peak-to-average ratio signal is used to detect the peak value of the signal, and the peak amplitude and phase information are output to the peak forming module, and the peak position is output to the distributor module.
  • the peak forming module outputs the peak forming factor.
  • the distributor module is the detected peak value Allocating Cancellation Pulse Generators (CPG); CPG generates cancellation pulses, which are pre-stored, and the design of the cancellation pulses depends on the bandwidth of the signal, etc., and the number of CPGs is variable;
  • the cancellation pulses corresponding to the multiple peaks are respectively multiplied by the peak shaping factors corresponding to each peak, which is called clipping noise; the input peak is equal to the signal after the appropriate delay, minus the clipping noise, and the output is reduced.
  • each resource block ie, a time-frequency resource composed of several OFDM symbols and several subcarriers
  • the PC-CFR algorithm adopts a fixed and in-band amplitude-frequency response consistent cancellation pulse.
  • the EVM obtained by clipping all the modulation data is almost the same. Because the requirements of the EVM are different for different modulation modes under the premise of ensuring correct demodulation of data, the same EVM is not conducive to further improving the efficiency of the PA.
  • the invention provides a signal clipping processing method and device to meet the requirements of different modulation modes for EVM and improve the efficiency of the power amplifier.
  • a method of clipping a signal comprising:
  • each of the peak signals according to amplitude information and phase information of each of the peak signals a corresponding peak shaping factor for adjusting the amplitude and/or phase of the cancellation pulse sequence corresponding to the peak signal, and outputting a corresponding cancellation pulse sequence according to position information of each of the peak signals, wherein
  • the cancellation pulse sequence is determined according to scheduling information of a baseband unit BBU, where the scheduling information is used to indicate a modulation mode used by each resource block that transmits the input signal to transmit data symbols;
  • the method further includes: performing delay processing on the input signal;
  • the difference between the input signal and the clipping noise is used as a signal after clipping, and includes: a difference between the delayed input signal and the clipping noise as a signal after clipping .
  • the following formula is used to obtain the peak signal.
  • Corresponding peak forming factor :
  • ⁇ is a peak shaping factor
  • is the amplitude information of the peak signal
  • ⁇ is a set clipping threshold
  • ⁇ is phase information of the peak signal
  • the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, in a third possible implementation manner, determining the pair according to the scheduling information Pulse cancellation sequence including:
  • the determined cancellation pulse subsequence corresponding to each of the resource blocks is added to obtain the cancellation pulse sequence.
  • determining the cancellation pulse sequence according to the scheduling information includes:
  • the cancellation pulse sequence is re-determined according to the updated scheduling information.
  • the input signal is a baseband signal from the baseband unit BBU, Or the signal after the last clipping process.
  • the method before the peak detection of the input signal, the method also includes:
  • the received input signal is subjected to upsampling processing, and the upsampled processed signal is used as an input signal for peak detection.
  • a communication device includes:
  • a cancellation pulse determination module configured to determine a cancellation pulse sequence according to scheduling information of the baseband unit BBU, and send the cancellation pulse sequence to each cancellation pulse generation module, where the scheduling information is used Determining a modulation mode employed by each resource block transmitting the input signal to transmit a data symbol;
  • a peak detecting module configured to perform peak detection on the input signal, to obtain amplitude information, phase information, and position information of a peak signal of the input signal;
  • a peak shaping module configured to obtain, according to the amplitude information and the phase information of each of the peak signals, a magnitude and/or a phase corresponding to each of the peak signals for adjusting a cancellation pulse sequence corresponding to the peak signal Peak forming factor;
  • An allocation module configured to separately send location information of each of the peak signals to a corresponding cancellation pulse generating module
  • a cancellation pulse generating module for respectively outputting according to position information of each of the peak signals Corresponding cancellation pulse sequence
  • a processing module configured to sum product of a peak shaping factor corresponding to each of the peak signals and a corresponding cancellation pulse sequence to obtain clipping noise, and to obtain a difference between the input signal and the clipping noise, As a signal after clipping.
  • the communications device further includes: a delay module, configured to perform delay processing on the input signal;
  • the processing module is specifically configured to: use a difference between the delayed input signal and the clipping noise as a signal after clipping.
  • the peak molding module adopts the following formula to obtain a peak shaping factor corresponding to the peak signal:
  • ⁇ is a peak shaping factor
  • is the amplitude information of the peak signal
  • ⁇ is a set clipping threshold
  • ⁇ is phase information of the peak signal
  • the cancellation pulse determining module is specifically configured to be used :
  • the cancellation pulse determining module is further configured to:
  • the cancellation pulse sequence is re-determined according to the updated scheduling information, and the re-determined cancellation pulse sequence is sent to each cancellation pulse generation module. Update.
  • the input signal is a baseband signal from the baseband unit BBU, Or the signal after the last clipping process.
  • the communication device if the communication device is an RRU, the communication device further include:
  • An upsampling module respectively connected to the peak detecting module and the delay module, configured to perform upsampling processing on the received input signal, and input the upsampled processed signal to the peak detecting module as a The input signal of the peak detection module.
  • the processing module further For: sending the obtained clipping processed signal to the RRU for upsampling processing and intermediate frequency clipping processing.
  • a communication device includes:
  • a transceiver for receiving an input signal
  • a processor configured to determine a cancellation pulse sequence according to scheduling information of the BBU, where the scheduling information is used to indicate a modulation mode used by each resource block transmitting the input signal to transmit a data symbol; and the input signal is used Performing peak detection to obtain amplitude information, phase information, and position information of the peak signal of the input signal; and obtaining, according to the amplitude information and the phase information of each of the peak signals, corresponding adjustments for each of the peak signals a peak shaping factor of the amplitude and/or phase of the cancellation pulse sequence corresponding to the peak signal; transmitting position information of each of the peak signals to a corresponding cancellation pulse generator; respectively, according to each of the peak signals Position information, respectively outputting a corresponding cancellation pulse sequence; summing the product of the peak shaping factor corresponding to each peak signal and its corresponding cancellation pulse sequence to obtain clipping noise, and inputting the input signal
  • the difference of the clipping noise is used as a signal after the clipping process, and the clipped signal is output through the transceiver.
  • the processor is further configured to: Describe the input signal for delay processing
  • the processor uses the difference between the input signal and the clipping noise as a signal after clipping, comprising: using a difference between the delay-processed input signal and the clipping noise as clipping The processed signal.
  • the processor uses the following formula to obtain a peak shaping factor corresponding to the peak signal:
  • ⁇ is a peak shaping factor
  • is the amplitude information of the peak signal
  • ⁇ is a set clipping threshold
  • ⁇ is phase information of the peak signal
  • the processor is configured according to the scheduling information of the BBU. Determine the cancellation pulse sequence, including:
  • the processor is further configured to: when the scheduling information is changed, re-determine the information according to the updated scheduling information.
  • the cancellation pulse sequence is described, and the re-determined cancellation pulse sequence is sent to each cancellation pulse generation module for updating.
  • the input signal is a baseband signal from the BBU, or A signal after clipping.
  • the processor is further configured to: perform upsampling processing on the received input signal, and perform the upsampled processed signal as The input signal for peak detection.
  • the transceiver further For: sending the obtained clipping processed signal to the RRU for upsampling processing and intermediate frequency clipping processing.
  • the cancellation pulse sequence is determined according to scheduling information of the BBU, and the scheduling information is used to indicate a modulation mode used by each resource block for transmitting the input signal to transmit data symbols, that is, a cancellation pulse sequence
  • a cancellation pulse sequence It is determined according to the modulation mode used for transmitting the data symbols in each resource block of the input signal, so that after the clipping process is performed using the cancellation pulse sequence, the EVM loss of the data using different modulation modes is different. Therefore, under the premise of ensuring correct demodulation of data, the requirements of different modulation modes for EVM can be satisfied, so that the peak-to-average ratio of the signal after clipping is lower, and the efficiency of the power amplifier is further improved.
  • Figure 1 is a schematic diagram of input signal power and output signal power in CFR technology
  • FIG. 2 is a schematic diagram of a PC-CFR algorithm
  • FIG. 3 is a schematic diagram of a method for clipping a signal according to an embodiment of the present invention.
  • 4A is a schematic diagram of a frequency domain form of a cancellation pulse sequence according to an embodiment of the present invention.
  • 4B is a schematic diagram of a time domain form of a cancellation pulse sequence used in an embodiment of the present invention.
  • 5A is a schematic diagram of a frequency domain form of a cancellation pulse sequence used in the PC-CFR algorithm
  • 5B is a schematic diagram of a time domain form of a cancellation pulse sequence employed in the PC-CFR algorithm
  • FIG. 6 is a schematic diagram of resource block allocation according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a signal peak-to-average ratio obtained by using a PC-CFR algorithm
  • 8A is a constellation diagram using a QPSK method in a PC-CFR algorithm
  • 8B is a constellation diagram using a 16QAM method in the PC-CFR algorithm
  • 8C is a constellation diagram using a 64QAM method in the PC-CFR algorithm
  • FIG. 9 is a schematic diagram of a signal peak-to-average ratio obtained by using the method provided by the embodiment of the present invention.
  • FIG. 10A is a constellation diagram of a method using a QPSK method according to an embodiment of the present invention.
  • FIG. 10B is a constellation diagram of a 16QAM method in a method according to an embodiment of the present disclosure.
  • FIG. 10C is a constellation diagram of a 64QAM method in a method according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic diagram of a first communication device according to an embodiment of the present invention.
  • FIG. 12 is a schematic diagram of a second communication device according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic diagram of a third communication device according to an embodiment of the present invention.
  • FIG. 14 is a schematic diagram of a fourth communication device according to an embodiment of the present invention.
  • the clipping processing is performed, and on the premise of ensuring correct demodulation of the data, The peak-to-average ratio of the signal after the clipping process is made lower, thereby improving the efficiency of the power amplifier.
  • a method for clipping a signal includes:
  • S31 Perform peak detection on the input signal to obtain amplitude information, phase information, and position information of the peak signal of the input signal.
  • a peak shaping factor corresponding to each of the peak signals and a corresponding cancellation pulse sequence thereof The products are summed to obtain clipping noise, and the difference between the input signal and the clipping noise is used as a signal after clipping.
  • the cancellation pulse sequence is determined according to scheduling information of the BBU, and the scheduling information is used to indicate a modulation mode used by each resource block for transmitting the input signal to transmit data symbols.
  • the cancellation pulse sequence is determined according to a modulation mode used for transmitting data symbols for each resource block that transmits the input signal, so that after the cancellation pulse sequence is used for clipping, data of different modulation modes are used.
  • the EVM loss is different, so that the requirements of EVM can be satisfied by different modulation modes under the premise of ensuring correct demodulation of data, so that the peak-to-average ratio of the signal after clipping is lower, further improving the efficiency of the power amplifier. .
  • the above steps S31 to S33 are an iterative process, and generally need to go through 2 to 3 iterations, and the peak-to-average ratio of the output signal can reach a preset target. If it is the first clipping process, the input signal in the above steps S31 to S33 is the baseband signal from the BBU; if it is the second or subsequent clipping process, the input signal in the above steps S31 to S33 is the last clipping. Wave processed signal.
  • the foregoing steps S31 to S33 may be implemented in the radio remote unit or may be implemented in the baseband unit.
  • the scheduling information involved in the embodiment of the present invention includes a modulation mode used to transmit data symbols for each resource block of the input signal.
  • the scheduling information may be represented by bit information, such as every 2 bits.
  • QPSK Quadrature Phase Shift Keying
  • “10” indicates that the modulation mode used by the resource block to transmit data symbols is 16 Quadrature Amplitude Modulation (16QAM)
  • 16QAM 16 Quadrature Amplitude Modulation
  • 11 indicates that the modulation mode used by the resource block to transmit data symbols is 64QAM.
  • the modulation mode used for resource symbols 1 to 7 to transmit data symbols is QPSK modulation mode
  • the modulation mode used for resource blocks 8 to 13 to transmit data symbols is 16QAM modulation mode
  • the modulation modes used by resource blocks 14 to 20 for transmitting data symbols For the 64QAM modulation mode, 40-bit signaling can be used to indicate scheduling information, specifically: "010101010101101010101011111111111111111".
  • the scheduling information needs to be acquired from the baseband unit by interaction with the baseband unit; if the foregoing steps S31 to S33 are implemented in the baseband unit, The scheduling information can be obtained directly.
  • peak detection is performed on the input signal in step S31, and one peak signal can be detected, and two or more peak signals can also be detected;
  • step S32 for each peak signal detected in step S31, Corresponding peak shaping factors, and respectively outputting a cancellation pulse sequence corresponding to each peak signal; or, corresponding to the partial peak signals detected in step S31, obtaining corresponding peak shaping factors, and respectively outputting and partial peak signals
  • Each peak signal corresponds to a cancellation pulse sequence.
  • step S32 according to the amplitude information and the phase information of the peak signal, the following formula is used to obtain the amplitude of each of the peak signals for adjusting the cancellation pulse sequence corresponding to the peak signal.
  • Peak shape factor for and/or phase is used to obtain the amplitude of each of the peak signals for adjusting the cancellation pulse sequence corresponding to the peak signal.
  • ⁇ is a peak shaping factor
  • is the amplitude information of the peak signal
  • ⁇ is a set clipping threshold
  • ⁇ is phase information of the peak signal
  • the peak shaping factor corresponding to the peak signal obtained in step S32 is a complex number, and the amplitude and/or phase at the maximum point of the cancellation pulse sequence corresponding to the peak signal can be adjusted according to the peak shaping factor.
  • the amplitude or the like is scaled such that the amplitude and phase at the maximum point of the cancellation pulse sequence are the same as the amplitude and phase of the peak signal corresponding to the cancellation pulse sequence.
  • determining the cancellation pulse sequence according to the scheduling information including:
  • the determined cancellation pulse subsequence corresponding to each of the resource blocks is added to obtain the cancellation pulse sequence.
  • the resource block of the data carrying the high-order modulation mode (such as 64QAM) has a smaller amplitude-frequency response of the corresponding cancellation pulse sub-sequence in the frequency band occupied by the resource block.
  • the corresponding cancellation pulse subsequence has a large amplitude-frequency response in the frequency band occupied by the resource block.
  • the embodiment of the present invention has less influence on the data using the high-order debugging mode based on the determined cancellation pulse sequence, and has a greater influence on the data using the low-order modulation mode, thereby ensuring not only the data using different modulation modes at the receiving end. Both can be demodulated normally, and the peak-to-average ratio of the output signal is also lower.
  • the pulse subsequence corresponding to the QPSK data is used in the frequency band occupied by the resource block carrying the data.
  • the upper amplitude frequency response is the largest, and the pulse subsequence corresponding to the data of the 16QAM method is secondarily transmitted in the frequency band occupied by the resource block carrying the data, and the pulse subsequence corresponding to the data of the 64QAM method is used to carry the data.
  • the frequency-frequency response of the frequency band occupied by the resource block is the smallest, and the frequency domain form of the designed cancellation pulse sequence is as shown in FIG.
  • the time domain form is shown in FIG. 4B.
  • the frequency response of the cancellation pulse in the signal bandwidth is different in the frequency domain.
  • the cancellation pulse sequence becomes a plural form.
  • the specific value of the cancellation pulse sequence can be configured proportionally according to the target EVM value of different modulation modes.
  • the pulse subsequence corresponding to the QPSK data is used in the frequency band occupied by the resource block carrying the data.
  • the amplitude-frequency response is the largest, and the pulse-subsequence corresponding to the data of the 16QAM mode is secondarily transmitted in the frequency band occupied by the resource block carrying the data, and the pulse sub-sequence corresponding to the data of the 64QAM mode is used to carry the data.
  • the amplitude-frequency response in the frequency band occupied by the block is the smallest, and each pulse subsequence in the cancellation pulse sequence can be
  • the amplitude-frequency response is configured to be 1.5:1:0.5.
  • each resource block for indicating the transmission of the input signal is used to transmit data symbols.
  • the scheduling information of the modulation mode is also changed accordingly, and the cancellation pulse sequence is determined according to the scheduling information, including:
  • the cancellation pulse sequence is re-determined according to the updated scheduling information.
  • the method further includes:
  • the received input signal is subjected to upsampling processing, and the upsampled processed signal is used as an input signal for peak detection.
  • the input signal is upsampled by 5 times, and the digital intermediate frequency signal is output, that is, four zeros are added between the two sampling points, and a low-pass finite unit impulse response (FIR) filter is adopted.
  • the filter passband is 10MHz
  • the stopband is 20.72MHz
  • the sampling rate is 153.6MHz.
  • the embodiment of the present invention is not limited to adopting 5 times upsampling processing, and other multiples of upsampling processing may be used, but the upsampling multiple is too low, and the clipped radio frequency signal may have peak re-growth, and the upsampling multiple is too high. This will increase the complexity of the clipping process.
  • the embodiment of the present invention first performs an upsampling process on the input signal to avoid peak re-growth of the clipped RF signal.
  • the baseband signal of the 1st OFDM symbol is expressed as:
  • each subcarrier carries one data symbol, a total of 1200 subcarriers;
  • ⁇ f represents the subcarrier spacing (15KHz in this embodiment);
  • k represents the subcarrier number, and its value range is [-600 600].
  • the actual signal bandwidth is 18MHz, assuming that the resource block bandwidth available for scheduling is 900KHz, and the data symbols to be transmitted in the same resource block adopt the same modulation mode, and the scheduling period is 1ms, then the number of resource blocks is 20 in each scheduling period. .
  • the bandwidth is divided into three consecutive parts, each of which has a bandwidth of 6.3 MHz, 5.4 MHz, and 6.3 MHz, including 7, 6 and 7 resource blocks, respectively, and the three parts respectively transmit QPSK, 16QAM, and 64QAM data symbol.
  • the set peak-to-average ratio is 7dB.
  • the signal peak-to-average ratio is reduced from 9.62dB to 7.06dB, as shown in Figure 7, reaching the preset target.
  • the EVM point of view for the QPSK modulation symbol, it can be seen from the constellation diagram shown in FIG. 8A that the obtained EVM is 4.89%; for the 16QAM modulation symbol, it can be from the constellation diagram shown in FIG. 8B. It can be seen that the obtained EVM is 4.65%; for the modulation symbol of the 64QAM modulation symbol, it can be seen from the constellation diagram shown in Fig.
  • the obtained EVM is 4.97%, in this case, from the constellation
  • the QPSK and 16QAM data symbols are easily demodulated, and the EVM required by QPSK and 16QAM are less than 12.5% and 17.5%, respectively, indicating that there is room to further reduce the signal peak-to-average ratio.
  • the peak-to-average ratio is 6 dB
  • the peak-to-average ratio is reduced from 9.62 dB to 6.18 dB after three iterations using the method provided by the embodiment of the present invention, as shown in FIG.
  • the EVM of the 64QAM data symbol is 4.54% (the constellation diagram shown in Fig. 10A)
  • the EVM of the 16QAM data symbol is 8.61% (the constellation shown in Fig. 10B).
  • the EVM obtained by the QPSK data symbol is 11.92% (the constellation diagram shown in FIG. 10C).
  • the method provided by the embodiment of the present invention further reduces the signal peak-to-average ratio on the premise of ensuring normal demodulation of data symbols.
  • an embodiment of the present invention further provides a communication device, as shown in FIG.
  • the communication device includes:
  • the cancellation pulse determination module 111 is configured to determine a cancellation pulse sequence according to the scheduling information of the BBU, and send the cancellation pulse sequence to each cancellation pulse generation module 112 for storing, wherein the scheduling information is used for Determining a modulation mode employed by each resource block transmitting the input signal to transmit a data symbol;
  • the peak detecting module 113 is configured to perform peak detection on the input signal to obtain amplitude information, phase information, and position information of the peak signal of the input signal;
  • a peak shaping module 114 configured to obtain, according to amplitude information and phase information of each of the peak signals, a magnitude of each of the peak signals for adjusting a magnitude of a cancellation pulse sequence corresponding to the peak signal and/or Peak forming factor of phase;
  • the distribution module 115 is configured to separately send location information of each of the peak signals to a corresponding cancellation pulse generating module
  • the cancellation pulse generation module 112 is configured to respectively output corresponding cancellation pulse sequences according to position information of each of the peak signals;
  • the processing module 116 is configured to sum the product of the peak shaping factor corresponding to each of the peak signals and the corresponding cancellation pulse sequence to obtain clipping noise, and compare the difference between the input signal and the clipping noise. , as a signal after clipping.
  • the cancellation pulse sequence is determined according to scheduling information of the BBU, and the scheduling information is used to indicate modulation used by each resource block for transmitting the input signal to transmit data symbols.
  • the method that is, the cancellation pulse sequence is determined according to a modulation mode used by each resource block for transmitting the input signal to transmit data symbols, so that after the cancellation pulse sequence is used for clipping, data of different modulation modes are used.
  • the EVM loss is different, so that the requirements of EVM can be satisfied by different modulation modes under the premise of ensuring correct demodulation of data, so that the peak-to-average ratio of the signal after clipping is further reduced, further improving the power amplifier. effectiveness.
  • the communications device further includes: a delay module 117, configured to perform delay processing on the input signal;
  • the processing module 116 is specifically configured to: input the delayed input signal and the clipping noise The difference is used as the signal after the clipping process.
  • the peak shaping module 114 uses the following formula to obtain a peak shaping factor corresponding to the peak signal:
  • ⁇ is a peak shaping factor
  • is the amplitude information of the peak signal
  • ⁇ is a set clipping threshold
  • ⁇ is phase information of the peak signal
  • the cancellation pulse determination module 111 is specifically configured to:
  • cancellation pulse determination module 111 is further configured to:
  • the cancellation pulse sequence is re-determined according to the updated scheduling information, and the re-determined cancellation pulse sequence is sent to each cancellation pulse generation module for updating.
  • the input signal is a baseband signal from the BBU; if it is a second or subsequent clipping process, the input signal is the signal after the last clipping process.
  • the communication device if the communication device is an RRU, as shown in FIG. 12, the communication device further includes:
  • the upsampling module 118 connected to the peak detecting module 113 is configured to perform upsampling processing on the received input signal, and input the upsampled processed signal to the peak detecting module 113 as the peak detecting module. 113 input signal.
  • the processing module 116 is further configured to: send the obtained clipping processed signal to the RRU for upsampling processing. And IF clipping processing.
  • each module in the foregoing communication device provided by the embodiments of the present invention may be implemented by a specific circuit design.
  • an embodiment of the present invention further provides a communication device.
  • the communication device includes:
  • a transceiver 141 configured to receive an input signal
  • the processor 142 is configured to determine, according to the scheduling information of the BBU, the cancellation pulse sequence, where the scheduling information is used to indicate a modulation mode used by each resource block that transmits the input signal to transmit a data symbol;
  • the signal is subjected to peak detection to obtain amplitude information, phase information and position information of the peak signal of the input signal; and according to amplitude information and phase information of each of the peak signals, corresponding to each of the peak signals is obtained for Adjusting a peak shaping factor of a magnitude and/or a phase of the cancellation pulse sequence corresponding to the peak signal; transmitting position information of each of the peak signals to a corresponding cancellation pulse generator; respectively, according to each of the peaks Position information of the signal, respectively outputting a corresponding cancellation pulse sequence; summing the product of the peak shaping factor corresponding to each peak signal and its corresponding cancellation pulse sequence to obtain clipping noise, and the input signal and The difference of the clipping noise is used as a signal after the clipping process, and the clipped signal is outputted through the transce
  • the processor 142 is further configured to: perform delay processing on the input signal;
  • the processor 142 uses the difference between the input signal and the clipping noise as the clipped signal, and includes: using a difference between the delay-processed input signal and the clipped noise as a clipping Wave processed signal.
  • the processor 142 obtains a peak shaping factor corresponding to the peak signal by using the following formula:
  • ⁇ is a peak shaping factor
  • is the amplitude information of the peak signal
  • ⁇ is a set clipping threshold
  • ⁇ is phase information of the peak signal
  • the processor 142 determines the cancellation according to the scheduling information of the BBU. Pulse sequence, including:
  • processor 142 is further configured to:
  • the cancellation pulse sequence is re-determined according to the updated scheduling information, and the re-determined cancellation pulse sequence is sent to each cancellation pulse generation module for updating.
  • the input signal is a baseband signal from the BBU; if it is a second or subsequent clipping process, the input signal is the signal after the last clipping process.
  • the processor 142 is further configured to:
  • the received input signal is subjected to upsampling processing, and the upsampled processed signal is used as an input signal for peak detection.
  • the transceiver 141 is further configured to:
  • the obtained clipped signal is sent to the RRU for upsampling processing and intermediate frequency clipping processing.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It should be understood that the flow chart can be implemented by computer program instructions And/or a combination of the processes and/or blocks in the block diagrams, and the flowcharts and/or blocks in the flowcharts. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本发明公开了一种信号的削波处理方法和设备，以满足不同的调制方式对EVM的需求，提高了功率放大器的效率。方法包括：对输入信号进行峰值检测，得到输入信号的峰值信号的幅值信息、相位信息和位置信息；根据每个峰值信号的幅值信息和相位信息，得到每个峰值信号对应的峰值成型因子，并根据每个峰值信号的位置信息，分别输出对应的对消脉冲序列，其中，对消脉冲序列是根据BBU的调度信息确定的，调度信息用于指示传输输入信号的每个资源块传输数据符号所采用的调制方式；将每个峰值信号对应的峰值成型因子与其对应的对消脉冲序列的乘积求和，得到削波噪声，并将输入信号与削波噪声的差值，作为削波处理后的信号。

Description

一种信号的削波处理方法和设备 技术领域
本发明涉及无线通信技术领域，特别涉及一种信号的削波处理方法和设备。
背景技术
无线通信***中，基站***由基带单元(Baseband Unit，BBU)和射频拉远单元(Remote Radio Unit，RRU)组成。功率放大器(Power Amplifier，PA)是无线发射机射频拉远单元最重要的有源器件，其作用是对输入的信号进行放大。PA的效率是影响无线发射机成本的重要因素，但是PA不是完全理想的，当输入信号幅度超过PA线性放大范围，PA会引入非线性失真，即输出信号与输入信号呈现非线性放大的关系。为了保证PA的线性度，输入信号需要功率回退，功率回退的大小取决于信号的峰均比。峰均比是信号峰值功率与平均功率的比值。对于同一个PA而言，由于其增益是固定的，输出功率越高，则PA的效率越高。因此，为了保证PA的线性度，信号峰均比越高，就需要进行更多的功率回退，但这会导致输出功率越低。由于降低信号的峰均比，可间接地提高PA的效率，因此，信号峰均比是无线发射机关心的重要参数。
采用多载波技术(如正交频分复用(Orthogonal Frequency Division Multiplex，OFDM)等)的通信***，基带信号的峰均比高，常规的方法就是采用峰值因子降低(Crest Factor Reduction，CFR)技术，降低信号的峰均比。如图1所示，原始信号峰均比为A(即峰值功率除以信号平均功率)，一部分幅度较大的信号将位于非线性放大区；采用削波技术后，峰均比减小(图1中B所示)，此时，所有信号都位于线性放大区，更进一步的，可将输入信号平均功率增加，使得峰值功率加上增益仍与饱和点相等，从而提高PA效率。但是，CFR技术同时会使信号的误差矢量幅度(Error Vector Magnitude，EVM) 提升，EVM提升意味着接收端不容易解调。也就是说，CFR技术降低信号峰均比，是以牺牲EVM为代价的，如果EVM太高，接收端将无法保证所有调制方式的数据符号都正常解调。
目前被广泛使用的PC-CFR(Peak Cancellation CFR)算法是一种有效的降低信号峰均比的算法。其框图如图2所示，输入高峰均比信号，对信号进行峰值检测，输出峰值幅度和相位信息到峰值成型模块，同时输出峰值位置到分配器模块；其中，峰值成型模块输出峰值成型因子，可表示为α＝(|x|-γ)×exp(jθ)，|x|是峰值信号点的幅度，γ是削波门限，θ是峰值信号点的相位；分配器模块为检测出的峰值分配对消脉冲产生器(Cancellation Pulse Generators，CPG)；CPG生成对消脉冲，对消脉冲是预先存储好的，对消脉冲的设计取决于信号的带宽等信息，CPG的数量是可变的；多个峰值对应的对消脉冲分别乘以每个峰值对应的峰值成型因子再相加，称为削波噪声；输入高峰均比信号经过适当的时延后减去削波噪声，输出降低峰均比后的信号。一般需要经过2～3次的上述迭代，输出的信号峰均比可以达到预设目标。
OFDM***中，每个资源块(即若干OFDM符号和若干子载波组成的时频资源)可能传输不同调制方式的数据，而PC-CFR算法采用固定且带内幅频响应一致的对消脉冲，使得对所有调制方式的数据进行削波处理后得到的EVM几乎相同。由于在保证数据正确解调的前提下，对于不同的调制方式，接收端对EVM的需求是不同的，相同的EVM不利于进一步提高PA的效率。
发明内容
本发明提供了一种信号的削波处理方法和设备，以满足不同的调制方式对EVM的需求，提高了功率放大器的效率。
第一方面，一种信号的削波处理方法，该方法包括：
对输入信号进行峰值检测，得到所述输入信号的峰值信号的幅值信息、相位信息和位置信息；
根据每个所述峰值信号的幅值信息和相位信息，得到每个所述峰值信号 对应的用于调整所述峰值信号对应的对消脉冲序列的幅值和/或相位的峰值成型因子，并根据每个所述峰值信号的位置信息，分别输出对应的对消脉冲序列，其中，所述对消脉冲序列是根据基带单元BBU的调度信息确定的，所述调度信息用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式；
将每个所述峰值信号对应的峰值成型因子与其对应的对消脉冲序列的乘积求和，得到削波噪声，并将所述输入信号与所述削波噪声的差值，作为削波处理后的信号。
结合第一方面，在第一种可能的实现方式中，所述方法还包括：对所述输入信号进行延时处理；
将所述输入信号与所述削波噪声的差值，作为削波处理后的信号，包括：将延时处理后的输入信号与所述削波噪声的差值，作为削波处理后的信号。
结合第一方面、或者第一方面的第一种可能的实现方式，在第二种可能的实现方式中，根据所述峰值信号的幅值信息和相位信息，采用以下公式，得到所述峰值信号对应的峰值成型因子：
α＝(|x|-γ)×exp(jθ)；
其中，α为峰值成型因子，|x|为所述峰值信号的幅值信息，γ为设定的削波门限值，θ为所述峰值信号的相位信息。
结合第一方面、第一方面的第一种可能的实现方式、或者第一方面的第二种可能的实现方式，在第三种可能的实现方式中，根据所述调度信息，确定所述对消脉冲序列，包括：
根据所述调度信息，确定每个所述资源块传输数据符号所采用的调制方式；
根据每个所述资源块传输数据符号所采用的调制方式的阶数，确定每个所述资源块对应的对消脉冲子序列，其中，所述资源块传输数据符号所采用的调制方式的阶数越高，其对应的对消脉冲子序列在所述资源块所占频带上的幅频响应越小；
将确定出的每个所述资源块对应的对消脉冲子序列相加，得到所述对消脉冲序列。
结合第一方面的第三种可能的实现方式，在第四种可能的实现方式中，根据所述调度信息，确定所述对消脉冲序列，包括：
当所述调度信息发生改变时，根据更新后的调度信息，重新确定所述对消脉冲序列。
结合第一方面、或者第一方面的第一种至第四种可能的实现方式中的任一方式，在第五种可能的实现方式中，所述输入信号为来自基带单元BBU的基带信号，或者上一次削波处理后的信号。
结合第一方面、或者第一方面的第一种至第五种可能的实现方式中的任一方式，在第六种可能的实现方式中，在对所述输入信号进行峰值检测之前，该方法还包括：
对接收到的输入信号进行上采样处理，并将上采样处理后的信号作为进行峰值检测的输入信号。
第二方面，一种通信设备，该通信设备包括：
对消脉冲确定模块，用于根据基带单元BBU的调度信息，确定对消脉冲序列，并将所述对消脉冲序列发送给每个对消脉冲产生模块进行存储，其中，所述调度信息用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式；
峰值检测模块，用于对输入信号进行峰值检测，得到所述输入信号的峰值信号的幅值信息、相位信息和位置信息；
峰值成型模块，用于根据每个所述峰值信号的幅值信息和相位信息，得到每个所述峰值信号对应的用于调整所述峰值信号对应的对消脉冲序列的幅值和/或相位的峰值成型因子；
分配模块，用于将每个所述峰值信号的位置信息分别发送给相应的对消脉冲产生模块；
对消脉冲产生模块，用于根据每个所述峰值信号的位置信息，分别输出 对应的对消脉冲序列；
处理模块，用于将每个所述峰值信号对应的峰值成型因子与其对应的对消脉冲序列的乘积求和，得到削波噪声，并将所述输入信号与所述削波噪声的差值，作为削波处理后的信号。
结合第二方面，在第一种可能的实现方式中，所述通信设备还包括：延迟模块，用于对所述输入信号进行延时处理；
所述处理模块具体用于：将延时处理后的输入信号与所述削波噪声的差值，作为削波处理后的信号。
结合第二方面、或者第二方面的第一种可能的实现方式，在第二种可能的实现方式中，所述峰值成型模块采用以下公式，得到所述峰值信号对应的峰值成型因子：
α＝(|x|-γ)×exp(jθ)；
其中，α为峰值成型因子，|x|为所述峰值信号的幅值信息，γ为设定的削波门限值，θ为所述峰值信号的相位信息。
结合第二方面、第二方面的第一种可能的实现方式、或者第二方面的第二种可能的实现方式，在第三种可能的实现方式中，所述对消脉冲确定模块具体用于：
根据所述调度信息，确定每个所述资源块传输数据符号所采用的调制方式；根据每个所述资源块传输数据符号所采用的调制方式的阶数，确定每个所述资源块对应的对消脉冲子序列，其中，所述资源块传输数据符号所采用的调制方式的阶数越高，其对应的对消脉冲子序列在所述资源块所占频带上的幅频响应越小；以及将确定出的每个所述资源块对应的对消脉冲子序列相加，得到所述对消脉冲序列。
结合第二方面的第三种可能的实现方式，在第四种可能的实现方式中，所述对消脉冲确定模块还用于：
当所述调度信息发生改变时，根据更新后的调度信息，重新确定所述对消脉冲序列，并将重新确定出的对消脉冲序列发送给每个对消脉冲产生模块 进行更新。
结合第二方面、或者第二方面的第一种至第四种可能的实现方式中的任一方式，在第五种可能的实现方式中，所述输入信号为来自基带单元BBU的基带信号，或者上一次削波处理后的信号。
结合第二方面、或者第二方面的第一种至第五种可能的实现方式中的任一方式，在第六种可能的实现方式中，若所述通信设备为RRU，所述通信设备还包括：
分别与所述峰值检测模块和所述延时模块连接的上采样模块，用于对接收到的输入信号进行上采样处理，并将上采样处理后的信号输入至所述峰值检测模块，作为所述峰值检测模块的输入信号。
结合第二方面、或者第二方面的第一种至第六种可能的实现方式中的任一方式，在第七种可能的实现方式中，若所述通信设备为BBU，所述处理模块还用于：将得到的削波处理后的信号，发送给RRU进行上采样处理和中频削波处理。
第三方面，一种通信设备包括：
收发器，用于接收输入信号；
处理器，用于根据BBU的调度信息，确定对消脉冲序列，其中，所述调度信息用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式；对所述输入信号进行峰值检测，得到所述输入信号的峰值信号的幅值信息、相位信息和位置信息；根据每个所述峰值信号的幅值信息和相位信息，得到每个所述峰值信号对应的用于调整所述峰值信号对应的对消脉冲序列的幅值和/或相位的峰值成型因子；将每个所述峰值信号的位置信息分别发送给相应的对消脉冲产生器；根据每个所述峰值信号的位置信息，分别输出对应的对消脉冲序列；将每个所述峰值信号对应的峰值成型因子与其对应的对消脉冲序列的乘积求和，得到削波噪声，并将所述输入信号与所述削波噪声的差值，作为削波处理后的信号，并通过所述收发器输出削波处理后的信号。
结合第三方面，在第一种可能的实现方式中，所述处理器还用于：对所 述输入信号进行延时处理；
所述处理器将所述输入信号与所述削波噪声的差值，作为削波处理后的信号，包括：将延时处理后的输入信号与所述削波噪声的差值，作为削波处理后的信号。
结合第三方面、或者第三方面的第一种可能的实现方式，在第二种可能的实现方式中，所述处理器采用以下公式，得到所述峰值信号对应的峰值成型因子：
α＝(|x|-γ)×exp(jθ)；
其中，α为峰值成型因子，|x|为所述峰值信号的幅值信息，γ为设定的削波门限值，θ为所述峰值信号的相位信息。
结合第三方面、第三方面的第一种可能的实现方式、或者第三方面的第二种可能的实现方式，在第三种可能的实现方式中，所述处理器根据BBU的调度信息，确定对消脉冲序列，包括：
根据所述调度信息，确定每个所述资源块传输数据符号所采用的调制方式；根据每个所述资源块传输数据符号所采用的调制方式的阶数，确定每个所述资源块对应的对消脉冲子序列，其中，所述资源块传输数据符号所采用的调制方式的阶数越高，其对应的对消脉冲子序列在所述资源块所占频带上的幅频响应越小；以及将确定出的每个所述资源块对应的对消脉冲子序列相加，得到所述对消脉冲序列。
结合第三方面的第三种可能的实现方式，在第四种可能的实现方式中，所述处理器还用于：当所述调度信息发生改变时，根据更新后的调度信息，重新确定所述对消脉冲序列，并将重新确定出的对消脉冲序列发送给每个对消脉冲产生模块进行更新。
结合第三方面、或者第三方面的第一种至第四种可能的实现方式中的任一方式，在第五种可能的实现方式中，所述输入信号为来自BBU的基带信号，或者上一次削波处理后的信号。
结合第三方面、或者第三方面的第一种至第五种可能的实现方式中的任 一方式，在第六种可能的实现方式中，若所述通信设备为RRU，所述处理器还用于：对接收到的输入信号进行上采样处理，并将上采样处理后的信号作为进行峰值检测的输入信号。
结合第三方面、或者第三方面的第一种至第六种可能的实现方式中的任一方式，在第七种可能的实现方式中，若所述通信设备为BBU，所述收发器还用于：将得到的削波处理后的信号，发送给RRU进行上采样处理和中频削波处理。
本发明中，由于对消脉冲序列是根据BBU的调度信息确定的，而所述调度信息用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式，即对消脉冲序列是根据传输所述输入信号的每个资源块传输数据符号所采用的调制方式确定的，这样，采用该对消脉冲序列进行削波处理后，采用不同调制方式的数据的EVM损失是不一样的，从而在保证数据正确解调的前提下，能够满足不同的调制方式对EVM的需求，使得削波处理后的信号的峰均比更低，进一步提高了功率放大器的效率。
附图说明
图1为CFR技术中输入信号功率和输出信号功率的示意图；
图2为PC-CFR算法的示意图；
图3为本发明实施例提供的一种信号的削波处理方法的示意图；
图4A为本发明实施例采用的对消脉冲序列的频域形式的示意图；
图4B为本发明实施例采用的对消脉冲序列的时域形式的示意图；
图5A为PC-CFR算法中采用的对消脉冲序列的频域形式的示意图；
图5B为PC-CFR算法中采用的对消脉冲序列的时域形式的示意图；
图6为本发明实施例中资源块分配示意图；
图7为采用PC-CFR算法得到的信号峰均比的示意图；
图8A为PC-CFR算法中采用QPSK方式的星座图；
图8B为PC-CFR算法中采用16QAM方式的星座图；
图8C为PC-CFR算法中采用64QAM方式的星座图；
图9为采用本发明实施例提供的方法得到的信号峰均比的示意图；
图10A为本发明实施例提供的方法中采用QPSK方式的星座图；
图10B为本发明实施例提供的方法中采用16QAM方式的星座图；
图10C为本发明实施例提供的方法中采用64QAM方式的星座图；
图11为本发明实施例提供的第一种通信设备的示意图；
图12为本发明实施例提供的第二种通信设备的示意图；
图13为本发明实施例提供的第三种通信设备的示意图；
图14为本发明实施例提供的第四种通信设备的示意图。
具体实施方式
本发明实施例中，结合基带单元的用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式的调度信息，进行削波处理，在保证数据正确解调的前提下，使得削波处理后的信号的峰均比更低，从而提高了功率放大器的效率。
下面结合说明书附图对本发明实施例作进一步详细描述。应当理解，此处所描述的实施例仅用于说明和解释本发明，并不用于限定本发明。
如图3所示，本发明实施例提供的一种信号的削波处理方法，包括：
S31、对输入信号进行峰值检测，得到所述输入信号的峰值信号的幅值信息、相位信息和位置信息；
S32、根据每个所述峰值信号的幅值信息和相位信息，得到每个所述峰值信号对应的用于调整所述峰值信号对应的对消脉冲序列的幅值和/或相位的峰值成型因子，并根据每个所述峰值信号的位置信息，分别输出对应的对消脉冲序列，其中，所述对消脉冲序列是根据BBU的调度信息确定的，所述调度信息用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式；
S33、将每个所述峰值信号对应的峰值成型因子与其对应的对消脉冲序列 的乘积求和，得到削波噪声，并将所述输入信号与所述削波噪声的差值，作为削波处理后的信号。
本发明实施例中提供的方法中，由于对消脉冲序列是根据BBU的调度信息确定的，而所述调度信息用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式，即对消脉冲序列是根据传输所述输入信号的每个资源块传输数据符号所采用的调制方式确定的，这样，采用该对消脉冲序列进行削波处理后，采用不同调制方式的数据的EVM损失是不一样的，从而在保证数据正确解调的前提下，能够满足不同的调制方式对EVM的需求，使得削波处理后的信号的峰均比更低，进一步提高了功率放大器的效率。
在实施中，上述步骤S31～步骤S33为一次迭代过程，一般需要经过2～3次迭代过程，输出的信号的峰均比可以达到预设目标。若为首次削波处理，上述步骤S31～步骤S33中的输入信号为来自BBU的基带信号；若为第二次或后续削波处理，则上述步骤S31～步骤S33中的输入信号为上一次削波处理后的信号。
在实施中，上述步骤S31～步骤S33可以在射频拉远单元中实现，也可以在基带单元中实现。
本发明实施例中所涉及的调度信息包括传输所述输入信号的每个资源块传输数据符号所采用的调制方式，作为一种优选的实现方式，调度信息可以采用比特信息表示，如每2比特代表一个资源块传输数据符号所采用的调制方式，“00”表示预留，“01”表示该资源块传输数据符号所采用的调制方式为正交相移键控(Quadrature Phase Shift Keying，QPSK)，“10”表示该资源块传输数据符号所采用的调制方式为16正交幅度调制(16Quadrature Amplitude Modulation，16QAM)，“11”表示该资源块传输数据符号所采用的调制方式为64QAM。假设资源块1～7传输数据符号所采用的调制方式为QPSK调制方式，资源块8～13传输数据符号所采用的调制方式为16QAM调制方式，资源块14～20传输数据符号所采用的调制方式为64QAM调制方式，则可以采用40比特信令来表示调度信息，具体为： “0101010101010110101010101011111111111111”。
在实施中，若上述步骤S31～步骤S33在射频拉远单元中实现，则需要通过与基带单元的交互，从基带单元处获取调度信息；若上述步骤S31～步骤S33在基带单元中实现，则可直接获取调度信息。
基于上述任一实施例，步骤S31中对输入信号进行峰值检测，可以检测出一个峰值信号，也可以检测出两个或两个以上的峰值信号；
相应的，若步骤S31中检测出多个峰值信号，并得到多个峰值信号的幅值信息、相位信息和位置信息，则步骤S32中，可以针对步骤S31中检测出的每个峰值信号，得到相应的峰值成型因子，并分别输出与每个峰值信号对应的对消脉冲序列；或者，可以针对步骤S31中检测出的部分峰值信号，得到相应的峰值成型因子，并分别输出与部分峰值信号中的每个峰值信号对应的对消脉冲序列。
在实施中，步骤S32中，根据所述峰值信号的幅值信息和相位信息，采用以下公式，得到每个所述峰值信号对应的用于调整所述峰值信号对应的对消脉冲序列的幅值和/或相位的峰值成型因子：
α＝(|x|-γ)×exp(jθ)；
其中，α为峰值成型因子，|x|为所述峰值信号的幅值信息，γ为设定的削波门限值，θ为所述峰值信号的相位信息。
具体的，步骤S32中得到所述峰值信号对应的峰值成型因子为一个复数，根据该峰值成型因子可以对所述峰值信号对应的对消脉冲序列的最大点处的幅值和/或相位进行调整，如缩放幅值等，以使该对消脉冲序列的最大点处的幅值和相位与该对消脉冲序列对应的峰值信号的幅值和相位相同。
在实施中，根据所述调度信息，确定所述对消脉冲序列，包括：
根据所述调度信息，确定出每个所述资源块传输数据符号所采用的调制方式；
根据每个所述资源块传输数据符号所采用的调制方式的阶数，确定每个所述资源块对应的对消脉冲子序列，其中，所述资源块传输数据符号所采用 的调制方式的阶数越高，其对应的对消脉冲子序列在所述资源块所占频带上的幅频响应越小；以及
将确定出的每个所述资源块对应的对消脉冲子序列相加，得到所述对消脉冲序列。
具体的，在设计对消脉冲序列时，对于承载高阶调制方式(如64QAM)的数据的资源块，其对应的对消脉冲子序列在该资源块所占的频带上的幅频响应较小；相反地，对于承载低阶调制方式(如QPSK)数据符号的资源块，其对应的对消脉冲子序列在该资源块所占的频带上的幅频响应较大。本发明实施例基于确定出的对消脉冲序列对采用高阶调试方式的数据影响较小，而对采用低阶调制方式的数据影响较大，从而不仅能够保证采用不同调制方式的数据在接收端都能够正常解调，还使输出信号的峰均比更低。
举例说明，假设18MHz的信号带宽所承载的数据分别采用QPSK、16QAM和64QAM，那么在设计对消脉冲序列时，采用QPSK方式的数据对应的脉冲子序列在承载该数据的资源块所占的频带上的幅频响应最大，采用16QAM方式的数据对应的脉冲子序列在承载该数据的资源块所占的频带上的幅频响应次之，采用64QAM方式的数据对应的脉冲子序列在承载该数据的资源块所占的频带上的幅频响应最小，设计出的对消脉冲序列的频域形式如图4A所示，时域形式如图4B所示。相比于现有PC-CFR对消脉冲序列的频域形式(如图5A所示)和时域形式(如图5B所示)，频域上，信号带宽内对消脉冲幅频响应不同，时域上，对消脉冲序列变成了复数形式。
较佳地，对消脉冲序列的具体值可根据不同调制方式的目标EVM值，按比例进行配置。举例说明，假设18MHz的信号带宽所承载的数据分别采用QPSK、16QAM和64QAM，那么在进行比例配置时，采用QPSK方式的数据对应的脉冲子序列在承载该数据的资源块所占的频带上的幅频响应最大，采用16QAM方式的数据对应的脉冲子序列在承载该数据的资源块所占的频带上的幅频响应次之，采用64QAM方式的数据对应的脉冲子序列在承载该数据的资源块所占的频带上的幅频响应最小，可将对消脉冲序列中各脉冲子序列 的幅频响应配置为1.5:1:0.5。
基于上述任一实施例，在实施中，由于每个资源块上传输数据符号所采用的调制方式是会变化的，因此，用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式的调度信息也会相应变化，则根据所述调度信息确定所述对消脉冲序列，包括：
当所述调度信息发生改变时，根据更新后的调度信息，重新确定所述对消脉冲序列。
基于上述任一实施例，在实施中，若上述步骤S31～步骤S33在射频拉远单元中实现，则S31之前，该方法还包括：
对接收到的输入信号进行上采样处理，并将上采样处理后的信号作为进行峰值检测的输入信号。
具体的，假设对输入信号进行5倍的上采样，输出数字中频信号，即在两个采样点之间补4个零，并通过低通有限单位冲击响应(Finite Impulse Response，FIR)滤波器，滤波器通带为10MHz，阻带为20.72MHz，采样率为153.6MHz。当然，本发明实施例不限于采用5倍的上采样处理，也可以采用其他倍数的上采样处理，但是上采样倍数过低，削波后的射频信号会出现峰值重生，上采样倍数过高，会导致削波处理的复杂度提高。本发明实施例在进行削波处理之前，先对输入信号进行上采样处理以避免削波后的射频信号出现峰值重生现象。
下面对采用本发明实施例提供的方法进行削波处理后的结果，与采用现有的PC-CFR算法进行削波处理后的结果进行比较。具体如下：
假设来自基带单元的基带信号是20MHz的长期演进(Long Term Evolution，LTE)信号。第l个OFDM符号的基带信号表示为：
Figure PCTCN2014095989-appb-000001
其中，ak,l表示载波上承载的待传输数据符号，每个子载波承载一个数据 符号，共1200个子载波；Δf表示子载波间隔(本实施例中为15KHz)；Ncp,l表示循环前缀采样点数；Ts＝1/fs表示采样时间(本实施中为fs＝30.72MHz)；k表示子载波编号，其取值范围是[-600 600]。
而实际信号带宽是18MHz，假设可供调度的资源块带宽为900KHz，同一资源块内待传输数据符号采用相同的调制方式，调度周期为1ms，那么每次调度周期内，资源块数量为20个。如图6所示，把带宽分为连续的三个部分，每个部分带宽为6.3MHz、5.4MHz和6.3MHz，分别包括7、6和7个资源块，三个部分分别传输QPSK、16QAM和64QAM的数据符号。
假设设定的峰均比目标为7dB，经过3次PC-CFR算法的迭代，信号峰均比由9.62dB下降到7.06dB，如图7所示，达到预设目标。从EVM角度来看，对于QPSK调制符号来说，从图8A所示的星座图中可以看出，得到的EVM为4.89％；对于16QAM调制符号来说，从图8B所示的星座图中可以看出，得到的EVM为4.65％；对于64QAM调制符号来说调制符号来说，从图8C所示的星座图中可以看出，得到的EVM为4.97％、，在这种情况下，从星座图可以看出，QPSK和16QAM数据符号很容易解调，QPSK和16QAM要求的EVM分别是小于12.5％和17.5％，说明还有进一步降低信号峰均比的空间。
假设设定的峰均比目标为6dB，采用本发明实施例提供的方法经过3次迭代后，峰均比由9.62dB下降到6.18dB，如图9所示。从EVM角度来看，输出的信号中，64QAM数据符号得到的EVM为4.54％(如图10A所示的星座图)，16QAM数据符号得到的EVM为8.61％(如图10B所示的星座图)，QPSK数据符号得到的EVM为11.92％(如图10C所示的星座图)，在这种情况下，从星座图可以看出，采用本发明实施例提供的方法进行削波处理后，QPSK、16QAM和64QAM三种调试方式的数据符号的EVM不同，但都可正常解调。可见，采用本发明实施例提供的方法，保证数据符号正常解调的前提下，进一步降低了信号峰均比。
基于同一发明构思，本发明实施例还提供了一种通信设备，如图11所示， 该通信设备包括：
对消脉冲确定模块111，用于根据BBU的调度信息，确定对消脉冲序列，并将所述对消脉冲序列发送给每个对消脉冲产生模块112进行存储，其中，所述调度信息用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式；
峰值检测模块113，用于对输入信号进行峰值检测，得到所述输入信号的峰值信号的幅值信息、相位信息和位置信息；
峰值成型模块114，用于根据每个所述峰值信号的幅值信息和相位信息，得到每个所述峰值信号对应的用于调整所述峰值信号对应的对消脉冲序列的幅值和/或相位的峰值成型因子；
分配模块115，用于将每个所述峰值信号的位置信息分别发送给相应的对消脉冲产生模块；
对消脉冲产生模块112，用于根据每个所述峰值信号的位置信息，分别输出对应的对消脉冲序列；
处理模块116，用于将每个所述峰值信号对应的峰值成型因子与其对应的对消脉冲序列的乘积求和，得到削波噪声，并将所述输入信号与所述削波噪声的差值，作为削波处理后的信号。
本发明实施例中提供的通信设备中，由于对消脉冲序列是根据BBU的调度信息确定的，而所述调度信息用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式，即对消脉冲序列是根据传输所述输入信号的每个资源块传输数据符号所采用的调制方式确定的，这样，采用该对消脉冲序列进行削波处理后，采用不同调制方式的数据的EVM损失是不一样的，从而在保证数据正确解调的前提下，能够满足不同的调制方式对EVM的需求，使得削波处理后的信号的峰均比更低，进一步提高了功率放大器的效率。
在实施中，所述通信设备还包括：延迟模块117，用于对所述输入信号进行延时处理；
所述处理模块116具体用于：将延时处理后的输入信号与所述削波噪声 的差值，作为削波处理后的信号。
在实施中，所述峰值成型模块114采用以下公式，得到所述峰值信号对应的峰值成型因子：
α＝(|x|-γ)×exp(jθ)；
其中，α为峰值成型因子，|x|为所述峰值信号的幅值信息，γ为设定的削波门限值，θ为所述峰值信号的相位信息。
基于上述任一实施例，所述对消脉冲确定模块111具体用于：
根据所述调度信息，确定每个所述资源块传输数据符号所采用的调制方式；根据每个所述资源块传输数据符号所采用的调制方式的阶数，确定每个所述资源块对应的对消脉冲子序列，其中，所述资源块传输数据符号所采用的调制方式的阶数越高，其对应的对消脉冲子序列在所述资源块所占频带上的幅频响应越小；以及将确定出的每个所述资源块对应的对消脉冲子序列相加，得到所述对消脉冲序列。
进一步，所述对消脉冲确定模块111还用于：
当所述调度信息发生改变时，根据更新后的调度信息，重新确定所述对消脉冲序列，并将重新确定出的对消脉冲序列发送给每个对消脉冲产生模块进行更新。
基于上述任一实施例，若为首次削波处理，所述输入信号为来自BBU的基带信号；若为第二次或后续削波处理，所述输入信号为上一次削波处理后的信号。
基于上述任一实施例，若所述通信设备为RRU，如图12所示，所述通信设备还包括：
与所述峰值检测模块113连接的上采样模块118，用于对接收到的输入信号进行上采样处理，并将上采样处理后的信号输入至所述峰值检测模块113，作为所述峰值检测模块113的输入信号。
基于上述任一实施例，若所述通信设备为BBU，如图13所示，所述处理模块116还用于：将得到的削波处理后的信号，发送给RRU进行上采样处理 和中频削波处理。
需要说明的是，本发明实施例提供的上述通信设备中的各模块的功能，可通过具体的电路设计来实现。
基于同一发明构思，本发明实施例还提供了一种通信设备，如图14所示，该通信设备包括：
收发器141，用于接收输入信号；
处理器142，用于根据BBU的调度信息，确定对消脉冲序列，其中，所述调度信息用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式；对所述输入信号进行峰值检测，得到所述输入信号的峰值信号的幅值信息、相位信息和位置信息；根据每个所述峰值信号的幅值信息和相位信息，得到每个所述峰值信号对应的用于调整所述峰值信号对应的对消脉冲序列的幅值和/或相位的峰值成型因子；将每个所述峰值信号的位置信息分别发送给相应的对消脉冲产生器；根据每个所述峰值信号的位置信息，分别输出对应的对消脉冲序列；将每个所述峰值信号对应的峰值成型因子与其对应的对消脉冲序列的乘积求和，得到削波噪声，并将所述输入信号与所述削波噪声的差值，作为削波处理后的信号，并通过所述收发器141输出削波处理后的信号。
在实施中，所述处理器142还用于：对所述输入信号进行延时处理；
所述处理器142将所述输入信号与所述削波噪声的差值，作为削波处理后的信号，包括：将延时处理后的输入信号与所述削波噪声的差值，作为削波处理后的信号。
在实施中，所述处理器142采用以下公式，得到所述峰值信号对应的峰值成型因子：
α＝(|x|-γ)×exp(jθ)；
其中，α为峰值成型因子，|x|为所述峰值信号的幅值信息，γ为设定的削波门限值，θ为所述峰值信号的相位信息。
基于上述任一实施例，所述处理器142根据BBU的调度信息，确定对消 脉冲序列，包括：
根据所述调度信息，确定每个所述资源块传输数据符号所采用的调制方式；根据每个所述资源块传输数据符号所采用的调制方式的阶数，确定每个所述资源块对应的对消脉冲子序列，其中，所述资源块传输数据符号所采用的调制方式的阶数越高，其对应的对消脉冲子序列在所述资源块所占频带上的幅频响应越小；以及将确定出的每个所述资源块对应的对消脉冲子序列相加，得到所述对消脉冲序列。
进一步，所述处理器142还用于：
当所述调度信息发生改变时，根据更新后的调度信息，重新确定所述对消脉冲序列，并将重新确定出的对消脉冲序列发送给每个对消脉冲产生模块进行更新。
基于上述任一实施例，若为首次削波处理，所述输入信号为来自BBU的基带信号；若为第二次或后续削波处理，所述输入信号为上一次削波处理后的信号。
基于上述任一实施例，若所述通信设备为RRU，所述处理器142还用于：
对接收到的输入信号进行上采样处理，并将上采样处理后的信号作为进行峰值检测的输入信号。
基于上述任一实施例，若所述通信设备为BBU，所述收发器141还用于：
将得到的削波处理后的信号，发送给RRU进行上采样处理和中频削波处理。
本领域内的技术人员应明白，本发明的实施例可提供为方法、***、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(***)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图 和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (15)

  1. 一种信号的削波处理方法，其特征在于，该方法包括：
    对输入信号进行峰值检测，得到所述输入信号的峰值信号的幅值信息、相位信息和位置信息；
    根据每个所述峰值信号的幅值信息和相位信息，得到每个所述峰值信号对应的用于调整所述峰值信号对应的对消脉冲序列的幅值和/或相位的峰值成型因子，并根据每个所述峰值信号的位置信息，分别输出对应的对消脉冲序列，其中，所述对消脉冲序列是根据基带单元BBU的调度信息确定的，所述调度信息用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式；
    将每个所述峰值信号对应的峰值成型因子与其对应的对消脉冲序列的乘积求和，得到削波噪声，并将所述输入信号与所述削波噪声的差值，作为削波处理后的信号。
  2. 如权利要求1所述的方法，其特征在于，所述方法还包括：对所述输入信号进行延时处理；
    将所述输入信号与所述削波噪声的差值，作为削波处理后的信号，包括：将延时处理后的输入信号与所述削波噪声的差值，作为削波处理后的信号。
  3. 如权利要求1或2所述的方法，其特征在于，根据所述峰值信号的幅值信息和相位信息，采用以下公式，得到所述峰值信号对应的峰值成型因子：
    α＝(|x|-γ)×exp(jθ)；
    其中，α为峰值成型因子，|x|为所述峰值信号的幅值信息，γ为设定的削波门限值，θ为所述峰值信号的相位信息。
  4. 如权利要求1～3任一项所述的方法，其特征在于，根据所述调度信息，确定所述对消脉冲序列，包括：
    根据所述调度信息，确定每个所述资源块传输数据符号所采用的调制方式；
    根据每个所述资源块传输数据符号所采用的调制方式的阶数，确定每个所述资源块对应的对消脉冲子序列，其中，所述资源块传输数据符号所采用的调制方式的阶数越高，其对应的对消脉冲子序列在所述资源块所占频带上的幅频响应越小；
    将确定出的每个所述资源块对应的对消脉冲子序列相加，得到所述对消脉冲序列。
  5. 如权利要求4所述的方法，其特征在于，根据所述调度信息，确定所述对消脉冲序列，包括：
    当所述调度信息发生改变时，根据更新后的调度信息，重新确定所述对消脉冲序列。
  6. 如权利要求1～5任一项所述的方法，其特征在于，所述输入信号为来自基带单元BBU的基带信号，或者上一次削波处理后的信号。
  7. 如权利要求1～6任一项所述的方法，其特征在于，在对所述输入信号进行峰值检测之前，该方法还包括：
    对接收到的输入信号进行上采样处理，并将上采样处理后的信号作为进行峰值检测的输入信号。
  8. 一种通信设备，其特征在于，该通信设备包括：
    对消脉冲确定模块，用于根据基带单元BBU的调度信息，确定对消脉冲序列，并将所述对消脉冲序列发送给每个对消脉冲产生模块进行存储，其中，所述调度信息用于指示传输所述输入信号的每个资源块传输数据符号所采用的调制方式；
    峰值检测模块，用于对输入信号进行峰值检测，得到所述输入信号的峰值信号的幅值信息、相位信息和位置信息；
    峰值成型模块，用于根据每个所述峰值信号的幅值信息和相位信息，得到每个所述峰值信号对应的用于调整所述峰值信号对应的对消脉冲序列的幅值和/或相位的峰值成型因子；
    分配模块，用于将每个所述峰值信号的位置信息分别发送给相应的对消 脉冲产生模块；
    对消脉冲产生模块，用于根据每个所述峰值信号的位置信息，分别输出对应的对消脉冲序列；
    处理模块，用于将每个所述峰值信号对应的峰值成型因子与其对应的对消脉冲序列的乘积求和，得到削波噪声，并将所述输入信号与所述削波噪声的差值，作为削波处理后的信号。
  9. 如权利要求8所述的通信设备，其特征在于，所述通信设备还包括：延迟模块，用于对所述输入信号进行延时处理；
    所述处理模块具体用于：将延时处理后的输入信号与所述削波噪声的差值，作为削波处理后的信号。
  10. 如权利要求8或9所述的通信设备，其特征在于，所述峰值成型模块采用以下公式，得到所述峰值信号对应的峰值成型因子：
    α＝(|x|-γ)×exp(jθ)；
    其中，α为峰值成型因子，|x|为所述峰值信号的幅值信息，γ为设定的削波门限值，θ为所述峰值信号的相位信息。
  11. 如权利要求8～10任一项所述的通信设备，其特征在于，所述对消脉冲确定模块具体用于：
    根据所述调度信息，确定每个所述资源块传输数据符号所采用的调制方式；根据每个所述资源块传输数据符号所采用的调制方式的阶数，确定每个所述资源块对应的对消脉冲子序列，其中，所述资源块传输数据符号所采用的调制方式的阶数越高，其对应的对消脉冲子序列在所述资源块所占频带上的幅频响应越小；以及将确定出的每个所述资源块对应的对消脉冲子序列相加，得到所述对消脉冲序列。
  12. 如权利要求11所述的通信设备，其特征在于，所述对消脉冲确定模块还用于：
    当所述调度信息发生改变时，根据更新后的调度信息，重新确定所述对消脉冲序列，并将重新确定出的对消脉冲序列发送给每个对消脉冲产生模块 进行更新。
  13. 如权利要求8～12任一项所述的通信设备，其特征在于，所述输入信号为来自基带单元BBU的基带信号，或者上一次削波处理后的信号。
  14. 如权利要求8～13任一项所述的通信设备，其特征在于，若所述通信设备为RRU，所述通信设备还包括：
    与所述峰值检测模块连接的上采样模块，用于对接收到的输入信号进行上采样处理，并将上采样处理后的信号输入至所述峰值检测模块，作为所述峰值检测模块的输入信号。
  15. 如权利要求8～14任一项所述的通信设备，其特征在于，若所述通信设备为BBU，所述处理模块还用于：
    将得到的削波处理后的信号，发送给RRU进行上采样处理和中频削波处理。
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CN108737308A (zh) * 2017-04-18 2018-11-02 鼎桥通信技术有限公司 峰值因子降低方法和装置
CN108737308B (zh) * 2017-04-18 2021-02-05 鼎桥通信技术有限公司 峰值因子降低方法和装置
CN114244672A (zh) * 2021-12-16 2022-03-25 南京濠暻通讯科技有限公司 一种用于5g通信的削峰方法及装置
CN114244672B (zh) * 2021-12-16 2024-03-22 南京濠暻通讯科技有限公司 一种用于5g通信的削峰方法及装置

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EP3226500B1 (en) 2019-04-03
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